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Muscular System Physiology
BIOL 207-Exam 2 for Dr. Anderson
24
Anatomy
Undergraduate 1
02/20/2015

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Term
muscle tension
Definition
force exerted on load or subject to be moved
Term
isometric contraction
Definition
no shortening; muscle tension increases but does not exceed load; cross bridges generate force but do not move actin filaments
Term
isotonic contraction
Definition
muscle changes in length and moves load; thin filaments slide
Term
motor unit
Definition
motor neuron and all muscle fibers it supplies
Term
muscle twitch
Definition
motor unit's response to single action potential of it;s motor neuron
Term
latent period
Definition
events of excitation-contraction coupling; no muscle tension
Term
period of contraction
Definition
cross bridge formation; tension increases
Term
period of relaxation
Definition
calcium re-enters the sarcoplasmic reticulum; tension declines to zero
Term
graded muscle responses
Definition
varying strength of contraction for different demands
Term
wave (temporal) summation
Definition
increased stimulus frequency (muscle does not completely relax between stimuli); second contraction is of greater force
Term
fused (complete) tetanus
Definition
no relaxation between stimuli; results in muscle fatigue
Term
recruitment
Definition
a response to change in stimulus strength where there is multiple motor unit summation to control force of contraction
Term
subthreshold stimuli
Definition
a response to change in stimulus strength where there is not observable contraction
Term
threshold stimulus
Definition
a response to change in stimulus strength where the stimulus strength causes first observable muscle contraction
Term
maximal stimulus
Definition
a response to change in stimulus strength to the point of strongest stimulus that increases contractile force
Term
size principle
Definition
the way in which recruitment works; motor units with smallest muscle fibers recruited first
Term
concentric contractions
Definition
muscle shortens and does work
Term
eccentric contractions
Definition
muscle generates force as it lengthens
Term
muscle tone
Definition
constant, slightly contracted state of all muscles due to spinal reflexes to keep muscles ready to respond
Term
anaerobic pathway
Definition
only uses glycolysis, produces latic acid; yields less ATP but much faster
Term
aerobic pathway
Definition
produces most of ATP during rest and light to moderate exercise
Term
muscle fatigue
Definition
physiological inability to contract despite continued stimulation
Term
oxidative fibers
Definition
muscle fiber type that uses aerobic pathways
Term
glycolytic fibers
Definition
muscle fiber type that uses anaerobic glycolysis
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